Calculating device



- C. T. OSTERBERG. CALCULATING DEVICE. APPLICATION FILED SEPT. 20. 1918.

Patented July 22, 1919.

Iva-aerate? AZ a? Tm: mLuAmm PLANOGRAPH c0., WASHINGTON, D. c

STATES: PATENT OFFIGEI.

cam. nosrnmmne, or m nwanxnnwwrsconsm, ASSIGNOR crown-HALF TOALLIENHUDSON, or MILWAUKEE, WISCONSIN.

CALCULATING DEVICE.

Specification of Letters Patent.

Patented July 22, 1919.

Application filed September 20, 1918; Serial No. 254,935.

citizen of the United States, and resident of Milwaukee, in the countyof Milwaukee and State of Wisconsin, have invented new and usefulImprovements in Calculating Devices, of which'the following is adescription, reference being had to the accompanying drawings, which areapart of this specification.

This invention relates to improvements in calculating devices.

It is one of the objects of the present invention to provide acalculating device of very compact size which may be easily carried inthe pocket or in a handbag and is adapted to easily indicate the amountof change to be received in purchasing articles.

A further object of the invention is to provide a calculating devicewhichis so simple in construction and inexpensive to manufacture as tobe particularly adapted for advertising purposes.

A further object of the invention is to provide a calculating devicewhich is of simple construction, is strong and durable and is welladapted for the purpose described.

With the above and other objectsin view, the invention consists of theimproved calculating device and the parts and comblna- 'tions as setforth in the claims, and all equivalents thereof.

In. the accompanyingdrawing in which the same-reference charactersindicate the same parts in all of the views:

Figure 1 is. a front side view of the improved calculating device;

Fig. 2 is a view of the opposite or rear side thereof;

Fig. 3 is a view similar to Fig. 1 with the front side portion removed;

Fig. 4 is a view similar to Fig. 2 with its rear side portion removed;and

Fig. 5 is a longitudinal sectional view on a larger scale, taken online55 of Fig. 1.

Referrin to the drawing, the numeral 8 indicates t e improvedcalculating device which comprises a front plate or sheet of material 9,a rear plate or sheet of material 10 in spaced relation thereto, andinterposed overlapped calculating disks 11 and 12.

The lates and disks are preferably formed of ce luloid and are connectedtogether by tubular rivets 18 which serve as journals for the disks 11and 12.

The peripheral portionsof the disks are serrated or toothed as indicatedby the numeral 14; and said peripheral portions project beyond theopposite ends of the plates to permit said the fingers.

The disk 11 on its front side, shown in Fig. 3, has the numerals one tonine and disks to be easily turned by naught delineated thereon inconsecutive order clockwise and spaced circumferentially therearound asindicated by the numeral 15. The numerals are spaced a short distancefrom the periphery of the disk and between said periphery and saidnumerals and in radial alinement therewith the disk is provided withapertures 16.

An elongated openingaperture 17 formed in the plate 9 medially of and inalinement with the tubular pivots 13 is positioned to permit any one ofthe numerals and the alined aperture to be turned into registertherewith and be visible therethrough.

The disks overlap each other between the tubular rivets and the frontface of the disk 12 which is positioned against the rear face of thedisk 11 is also provided with a circumferential line of spaced numeralsone to nine and naught extending anti-clockwise as indicated by 18 whichmay be turned to register with one of the apertures 16 when saidaperture is in register with the plate opening 17 and be visible throughsaid openings.

The disk 12 is also provided with a circumferential line of apertures 19which are in radial alinement with the numerals 18 ex cept the naught,and is also provided with a single aperture 20 which is in radialaline-. ment with the naught of the line 18 but is closer-to theperiphery of the disk 12 than the line of numerals 18.

The rear or opposite side of the disk 11 has delineated thereon twocircumferential lines of numerals 21 and 22 which register respectivelywith the aperture 19 and the Wlth.' The inner circumferential line ofnumerals 22 are arranged in successive clockwise order from one to tenwhile the outer circumferential line of numerals 21 extend in successiveclockwise order from one to nine and naught, and while the numerals arein radial alinement with the inner line of numerals, said inner numeralsare advanced one number in value over the adjacent outer line numerals21. V

The rear side of the disk 12 is provided with a circumferential line ofnumerals 24 circumferential lines of numerals on their oppositesideswhich may be turned to reg ister with the sight openings, said disksalso having circumferential lines of apertures which will register withthe plate openings and through which some of the numerals of one diskmay be viewed through the apereXtending in spaced successiveanticlocktures of the other disk.

wise order from one to nine with one blank dicated in Fig. 2. When thusturned the numerals 43 of the opposite or front sides of the disks willbe visible through the opening of the front plate to indicate the.

amount of change to be received from one dollar. If, for instance, thepurchase should amount to two dollars and fifty-seven cents and a tenderof five dollars be made it would only be necessary to mentally subtractthe next highest dollar amount of the purchase Which would be threedollars, from the five, leaving two dollars, and adding the two dollarsto the forty-three cents to indicate the correct amount of change to bereceived.

While for convenience of description the calculating device has beendescribed as having a front side and a rear side, it is to be understoodthat the sides are only relative in terms, and that the figures ofeither side can be used to indicate the amount spent,

I and the figures of the opposite side will indicate the amountremaining.

From the foregoing description it will be seen that the calculatingdevice is of very simple construction, and is well adapted for thepurpose described.

What I claim as my invention is:

l. A calculating device, comprising a pair of spaced plates having sightopemngs therein, and a pair of overlapped disks journaled between saidplates and having circumferential lines of numerals on their oppositesides which may be turned to register with the sight openings, saiddisks also having circumferential lines of apertures through which someof the numerals of one disk may be viewed through the apertures of theother disk.

2. A calculating device, comprising a pair of spaced plates having sightopenings therein, and a pair of overlapped disks journaled between saidplates and having 3. A calculating device, comprising a pair of plateshaving sight openings therein, and a pair of disks journaled betweensaid plates and having overlapped portions between the plate openings,said disks having circumferential lines of numerals on their oppositesides and also having circumferential lines of apertures, said lines ofnumerals and apertures being arranged to be moved to register with thesight openings of the plates and the disk apertures of one disk toregister with some of the numerals of the other disk.

4:. A calculating device, comprising a pair of plates having sightopenings therein, and a pair of disks journaled' between said plates andhaving overlapped portions between the plate openings, said disks havingcircumferential lines of numerals on their opposite sides and alsohaving circumferential lines of apertures, one of said disks having aplurality of circumferential lines of numerals on one of its sides, saidlines of numerals and apertures being arranged to be moved to registerwith the sight openings of the plates and the disk apertures of one diskto register with some of the nmnerals of the other disk.

5. A calculating device, comprising a pair of plates'having sightopenings therein, and a pair of disks journaled between said plates andhaving overlapped portions between the plate openings, said disks havingcircumferential hues of numerals .on their opposite sides and alsohavlng clrcumferential lines of apertures, one of said disks having aplu rality of circumferential lines of numerals on one of its sides, thenumbers of one line of said plurality of circumferential lines ofnumerals being advanced one number in value over the adjacent line ofnumerals,

portions between the plate openings, each disk having circumferentiallines of numerals on its opposite sides and one of the disks having-aplurality of circumferential lines of numerals on one of its sides, eachI disk also having circumferential line of apertures arran ed toregister with numerals of the other disi, said numerals arranged inconsecutive order.

7. A calculating device, comprising a pair of plates having mediallypositioned sight openings, and a pair of disks journaled between saidplates and having overlapped portions between the plate openings, eachdisk having circumferential lines of numerals on its opposite sides andone of the disks having a plurality of circumferential lines of numeralson one of its sides each disk also having a circumferential line ofapertures arranged to register with numerals of the other disk, saidnumerals arranged in consecutive order, the numerals of one diskextending in anticlockwise direction.

8. A calculating device, comprising a pair of plates having mediallypositioned sight openings, and a pair of disks journaled between saidplates and having overlapped portions between the plate openings, eachdisk having circumferential lines of numerals on 1ts opposite sides andone of the disks having a plurality of circumferential lines of numeralson one of its sides, each disk also having a circumferential line ofapertures arranged to register with numerals of the other disk, one ofthe disks having an aperture which is offset from the circumferentiallines of apertures, said numerals arranged in consecutive order.

9. A calculating device, comprising a pair Copies of this patent may beobtained for five cents each, by addressing the Commissioner of Patents,

of plates having medially positioned sight openings, and a pair of disksjournaled between said plates and having overlapped portions between theplate openings, each disk having circumferential lines of numerals onits opposite sides and one of the disks having a plurality ofcircumferential lines of numerals on one of its sides, each disk alsohaving a circumferential line of apertures arranged to register withnumerals of the other disk, one of the disks having an aperture which isoifsetfrom the circumferential lines of apertures and also having anumeral which is offset from one of the circumferential lines ofnumerals, said numerals arranged in consecutive order.

10. A calculating device, comprising a pair of plates having mediallypositioned sight openings, and a pair of disks journaled between saidplates and having overlapped portions between the plate openings, saiddisks having serrated peripheries which project beyond the opposite endsof the plates, each disk having circumferential lines of numerals on itsopposite sides and one of the disks having a plurality ofcircumferential lines of numerals on one of its sides, each disk alsohaving a circumferential line of apertures arranged to register withnumerals of the other disks, said numerals arranged in consecutiveorder.

In testimony whereof, I aflix my signature.

CARL T. OSTERBERG.

Washington, D. G. I

